That's not how the EU works. To give just one major example, our constitution regularly overrules EU law - Ireland has to go to referendum for Treaties - e.g. The Lisbon Treaty.
No, no it doesn't. The primacy of EU law is completely negated in a number of fairly basic instances - the common market first and foremost.
Specifically for Ireland, we are the only EU member state that are obliged to hold public referendums on Treaties. Ratification of the Treaty in all other member states is decided upon by the states' national parliaments.
Ireland, Netherlands, and Luxembourg also have veto powers when it comes to EU wide regulations. That's why Article 116 exists. You don't know what you're talking about.
Why are you talking about Poland in Irish case now? :)
A case which questions the ability of EU to override Polish consistution. Did you establish that corporate tax law is a consistutional issue? And note that the decision the tribunal has made that redress for differences between EU law and Polish law will have to be handled by: leaving EU, changing the constitution or changing the EU law. I'm not sure Poland wants to push that.
Nobody foresaw how things would pan out literally decades later.